Overview:-Estimated achievement difficulty: 6/10-Offline: 48/50 (925)-Online: 2/50 (75) (Defender, Master and Commander)-Approximate amount of time to 1000: 60+ Hours-Minimum number of playthroughs needed: 1 (2 if not importing save)-Number of missable achievements: Depends on how you play. There is no replay of chapters, so you want to get all the side-quests done in one playthrough. The major ones are Paramour, Saboteur and Liberator.-Do cheat codes disable achievements? No cheats-Does difficulty affect achievements? Yes (Insanity Difficulty)-Glitchy achievements: None-Unobtainable achievements? None-Extra equipment needed? Kinect can be used for voice control (optional). What is required to do multiplayer is the Online Pass. So if this is a rental, you will be alone.

Introduction:
You can play Mass Effect 3 from scratch if you have never played the previous games. If you have a save file from a previous Mass Effect, you will be able to import your character and save yourself an entire playthrough. This game has a lot of story-related and kill-based achievements with a few other random ones. There is only one basic difficulty achievement, which is for Insanity. There are no collectible based achievements in this game, so you can cross that off your stress list. Also, in the main menu, you are able to look up your achievements and see a tracker that shows how many you have towards that achievement. It will also pop up your status as you play, so you never have to look at it.

Step 1a (New Game): New Game on Easy/Narrative:
If you're new to Mass Effect and are starting from scratch, that's perfectly fine! The game does not require you to have played before. You can play on easy to get the hang of things and build up your level before moving on to a 2nd game. This playthrough is up to you. You can even put the difficulty on "narrative" which is easy mode to the extreme.

Step 1b (Imported Character): Insanity Playthrough:
If you have imported a save from a previous Mass Effect, you only have to beat the game once. You should be gaining all of the campaign based achievements.

Step 2 (New Game): Insanity Playthrough:
After playing the game for the first time, you are ready for Insanity. You'll have to be more patient while fighting in this playthrough. Make use of your powers and squad as much as you can.

Step 3: Multiplayer/N7 Missions
There are a few achievements that can be done easier online, such as using some of the powers that your single player character may not have (especially if you are a Soldier). It is also much easier to max your level online and be promoted than to get max level in the campaign. However, doing the N7 Missions on Insanity is probably easier than finishing all the MP maps on Gold unless you have a few high-levels friends to help.

Step 4: Mop Up
At this point if you only did one playthrough and did not get a level 10 weapon online, you'll want to do a NG+ and finish Gunsmith, as well as any other power or kill-based achievements you may have missed.

ConclusionAside from the difficulty of Insane and Gold online, the achievements are all fairly simple here. Be wary of the timed side-quests (see the link in "Unwavering") and you'll be set for your 1000!

This is a side-quest unlocked after completing the main story mission "Priority: Geth Dreadnought." It will be marked as "Geth Comm Hub" on the galaxy Map. The main quest will appear near this one (labeled "Reaper Base") if you do "Rannoch: Admiral Koris" first - make sure you DO NOT do that mission before completing this, or this one will not be available anymore.

This is a side-quest unlocked by talking with Traynor after "Priority: Citadel 2."

Obtained: After completing the mission Arrae: Ex-Cerberus Scientists.

Patriot 25 Make the final assault.

Story related, can't be missed.

Obtained: After completing the mission Priority: Earth.

Legend 50 Mission accomplished.

Story related, can't be missed.

Obtained: After completing the entire main story on any difficulty.

Shopaholic 10 Visit a store in the single-player campaign.

The first chance you get for this is when reaching the Citadel. When you go to the Huerta Memorial Hospital, the store is straight across from the counter. It's actually a computer that you can buy things from. If you press and click the , you'll see a map. Stores look like coins with an arrow going around them in a square shape. You do not have to actually purchase anything, just visit one by pressing on it.

Master and Commander 50 Deliver most of the Galaxy at War assets to the final conflict.

For this you will need to have over 4000 "Effective Military Strength" before beginning the mission "Priority: Cerberus Headquarters." You will gain assets through playing the main story, doing side-quests and scanning systems to retrieve resources (see "Lost and Found"). It is possible to do this at 50% readiness (without playing online), but you have to be extremely thorough and it will require 8000+ Total Military Strength. On top of that, some assets won't be available depending on your choices from ME1/ME2 so you may have a game that you made some bad choices and can't get some larger bonuses which would require you to play the entire trilogy over. You need to play the MP anyway to get "Defender" so you really should invest a few hours into the MP to boost your Readiness.

To make the achievement much easier, simply play a few games online to increase your Readiness Rating. If you do not play online for a while, your readiness percentage will begin to decline. I would suggest doing the "Defender" achievement right before this one, that way you've got a full 100% readiness and will be plenty over the required amount.

To clarify, the bottom number in the image below (with the accompanying green bar) is the one you need to have above 4000. The Total Military Strength will get reduced by your Readiness Rating which will equal your Effective Military Strength (TMSxRR=EMS). If you complete the "Defender" achievement you will get 100% for the Readiness Rating which will give you full use of your Total Military Strength. It will equal your Effective Military Strength, which (assuming you have 4000+) will net you the achievement.

And again, you can not get the full 1000 Gamerscore without buying the Online Pass and playing the MP portion of the game ("Defender" achievement) so there is no need to kill yourself trying to find every possible War Asset available. Just play a few games online to get your Readiness up and get more use of your assets.

Lost and Found 25 Dispatch 10 probes to retrieve people or resources in Reaper territory.

Once inside Reaper territory you can use to scan for resources. EDI will let you know if something has been found. Enter the planet's orbit that gets marked, to start the scan, then hold while you rotate the planet until a white light shows up. Then hit and launch a probe to retrieve the resource. Sometimes you will find things related to your sidequests. If you need to "find something", many times it's something you find while looking for resources.

Note: You may keep reloading your checkpoint after finding one if you want to get this achievement out of the way faster.

Long Service Medal 50 Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.

If you have a Mass Effect 2 save file, you may import it to this game. Doing so will mean you only have to beat the game once. Choose Insanity to do it in one playthrough. If you don't have a save, then you will have to beat this game twice and start at Level 1 progress. Start on an easier playthrough since you'll have to beat it again anyways, then play Insanity on the 2nd.

Insanity 75 Finish the game on Insanity without changing difficulty after leaving Earth.

To make sure you get the achievement, before starting a new game go to Extras from the Main Menu. Go into "Options" and to "Gameplay." Choose Insanity for the Combat Difficulty.

If you started the game already you can still change the difficulty as long as you have not beaten the first mission on Earth. Press and go to "Options". Go into "Gameplay" and you can change the difficulty to Insanity. This must be one before leaving so do it right away. If you find yourself on Mars, you have gone too far and will have to restart.

This mode requires a lot of patience and is best done with power heavy classes (so that you do not run out of ammo) or do the From Ashes DLC first to get the Particle Rifle weapon for unlimited ammo. If you did not import a save and have to play twice anyways, save this for a 2nd playthrough. If you have an import, go ahead and start on this difficulty right away. It's not extremely hard and as long as you save often with full health and keep a backup file, you'll be in good shape.

A Personal Touch 10 Modify a weapon.

Modifying a weapon requires mods (purchased or found). Once you have mods that fit a specific weapon type you own, you may go to a Weapon Bench and apply it. To do so, select a weapon and you should see the bottom right part of the screen that says "Weapon Mods." Press which brings you to another screen. Select the mod using then press to confirm. The first time this can be done is in the Citadel in the Embassies (shooting range), but there is one in the Normandy when you finally get aboard as well.

Paramour 25 Establish or rekindle a romantic relationship.

Like the other Mass Effect games, you have the ability to romance another character and get this achievement. Below is a list of characters available for romance. You must be nice to them, talk to them whenever you can, and eventually play out a romantic scene with them.

Basically they all have certain criteria that must be met. First being, they are actually alive. Some require you to have romanced them before. The only characters that are 100% to romance under new or imported, is Liara (male and female), Cortez (male only) and Traynor (female only). Everyone else has a special condition. The easiest romances will come from Cortez and Traynor.

Diana Allers Note: It has been said this character can be romanced, but you will not get the achievement for doing so.

A combo indicates you have used 2 powers on the same enemy, one after another. These should come naturally. There are many combos and you'll probably use them without thinking. An example is Singularity which raises an opponent up, then using Throw to knock the enemy flying. A tech burst is basically a weapon power. Both powers have to be of the same type to raise the counter (using a biotic Singularity and then a tech Incendiary won't count, for instance) and at least one needs to be done personally by you.

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself).

Focused 25 Evolve any of your powers to rank 6.

There are a total of 6 ranks for each power that you have. Each rank costs as many points = to the value of rank. Rank 1 costs 1 point, Rank 2 costs 2 points, etc. Therefore, you will need a total of 21 points to rank a power up completely. You should be able to get this easily while playing through the game. To get to this menu, press and go to "Squad." Highlight the power of choice and press . Now you will be put into a menu with the stats of the powers and what each upgrade will do for you. If you mess up, you can press to undo the upgrade. Be aware, if you leave the menu after upgrading, you will no longer have the undo option.

Imported Character: If you imported your character and beat Mass Effect 2, likely you will be a level 30 already and have points to spend. As soon as you can move you may upgrade and get to rank 6 on a power if it's close. This could very well be your first achievement.

Recruit 10 Kill 250 enemies.

See "Veteran" achievement description.

Soldier 15 Kill 1,000 enemies.

See "Veteran" achievement description.

Veteran 25 Kill 5,000 enemies.

This is a lot of enemies to kill. If you die, the enemies you killed will have counted. Therefore, it is technically possible to get this in one playthrough of the campaign. If not, you may get the rest in another playthrough or within the multiplayer "wave" based gametype.

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself).

Bruiser 10 Kill 100 enemies with melee attacks.

To perform a melee attack, press . You will learn this attack early on in the game and if you want, you can even level up the power "fitness" which helps with melee damage. Holding will give you a heavy attack. The most useful melee attack will be when you are in cover and an enemy is on the other side of the barrier . In most cases, if you hold when there is an indicating arrow, you will do an instant kill. I found the easiest enemies to kill were the Husks. They also only melee, and there are always plenty of them when they attack.

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself).

The galaxy map is located on the Normandy and is required for space travel. While in this view, you have the ability to fire a sensor pulse (see "Lost and Found") which detects War Assets for you. Reapers (an alien enemy) have a chance to pick up on this signal. You will notice a "Reaper Alertness" bar on the bottom left of your screen. After it ets full Reaper vessels will fly after you. They are faster and it will be game over if they get on you. The achievement requires you to get the alertness up full, and then go through the Mass Relay to escape. The best thing to do is save before trying. Get your alertness up and escape. Afterwards, just reload. An extremely easy way is to follow the route in the video which is extremely short. You can get this achievement in a minute or two.

Defender 25 Attain the highest level of readiness in each theater of war.

This is the only achievement that REQUIRES you to play online (unless you have an iOS device - see below). Many others can be made a bit easier through the MP, but this will force you to either buy the game new for the code or purchase an Online Pass. You need to have each theater of war on the Galaxy at War map at 100% at the same time. The fastest way to obtain this is to play Bronze, Random matches. This way you will receive a 3% increase to each theater of war per match at once (instead of only one theater), requiring only 17 matches to unlock (you start at 50% readiness).

The only alternative to buying the Online Pass to play the normal MP portion of the game is if you own an iOS device or Android (purchasing from the app stores from Apple or Google) and download the "Datapad" app (free), or purchase the "Infiltrator" game ($7) which can also increase your Galactic Readiness.

Overload Specialist 15 Overload the shields of 100 enemies.

Shields are on specific enemies. You will know there is a shield because above the health bar of the enemy you will see a blue shield bar. Overload is a specific power that looks like electricity going in all directions. Use this 100 times on enemies that have shields.

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself). Must be done by your Shep! Squad uses do not count.

Sky High 15 Lift 100 enemies off the ground with powers.

Lift is not actually a power itself. There are a few powers that make enemies fly off their feet. Examples would include Throw, Pull, Biotic Charge, Concussive Shot and Singularity. Despite lifting enemies in the air before dropping them, Slam does not.

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself). Must be done by your Shep! Squad uses do not count.

Pyromaniac 15 Set 100 enemies on fire with powers.

There are a few powers that result in the enemy becoming on fire. These include Incendiary based powers. Incendiary ammo with the Soldier class is going to be the easiest.

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself). Must be done by your Shep! Squad uses do not count.

Eye of the Hurricane 10 Kill a brute while it's charging you.

You will be introduced to the Brute enemy during your mission on Palaven. This is the first main story mission after visiting the Citadel for the first time. As you are killing husks with a turret defending a barricade, your next fight will be against this monstrosity. Wear down the armor first, and try to avoid the husks that are also attacking. When you get it to 1 bar left, wait for it to charge at you. When it does, shoot it with your most powerful power or weapon. If it dies and isn't charging, you can try to let the husk enemies finish you off so you can restart the battle. These also appear online in the later waves if you miss them all in the campaign.

Mail Slot 10 Kill 10 guardians with headshots from the front while their shields are raised.

Guardians are the enemies that walk around with shields in front of them. On the shield there is a rectangle hole for them to look through. For the achievement, you must shoot through this hole to kill the enemy (shooting in the hole results in a headshot most of the time).

Note: Even after dying, the ones you have obtained count. They count across all playthroughs as well as multiplayer (which you can play by yourself).

To hijack an atlas, you will need to focus fire on the yellow glass on the front to shatter it and expose the driver. This should take 8-10 shots with a sniper rifle or more with a weaker gun (less on a lower difficulty level than Insanity). From there, kill the driver. Once he is dead, simply run up to the stationary mech and hop in.

I personally got this during the From Ashes DLC in the final battle. Does not count by jumping in an already abandoned mech! You have to personally kill the driver and take over one that was previously attacking you.

Harvesters are the giant flying horse type enemies. You'll only encounter about a half dozen or so throughout the campaign. Use ammo and powers that are effective against armor for best results. You'll first start seeing them on Tuchanka. Specifically, you will be after one on that planet trying to save a team of Turians. Don't worry if you don't kill them right away, as it can fly off. The end of the mission mentioned specifically makes you kill it at the end. When fighting it, just make sure there is something in the way and you can shoot one of it's body parts that are exposed.

Enlisted 5 Start a character in multiplayer or customize a character in single-player.

If you use the default character in single-player, you will not get this achievement. If you use a customized one, you will at the start of the mission (when you can actually walk around). If you start up a multiplayer, you will be given the option to customize a character as well. This is an easy achievement and very well may be the first. If you wish to use default, then you can also start a random game just for the achievement then erase it.

Tour of Duty 20 Finish all multiplayer maps or all N7 missions in single-player.

There are a total of 6 multiplayer maps, and 6 N7 missions.

SP: The N7 missions are not story related and are optional quests found within the campaign. You must actually do them all before you finish the game or you will have to resort to multiplayer in order to gain the achievement.

MP: You just have to finish all of the waves for each map. This can be done on the Bronze difficulty to make things easier. Best done with a full team and with a few levels under your belt to have upgraded weapons and powers.

Always Prepared 10 Obtain two non-customizable suits of armor.

You need to buy 2 suits of armor (each costing 50,000 in different Citadel stores), or supplement that with two other promotional bonus armors. These cannot be upgraded or or interchanged with each other. You can buy them and reload your checkpoint if you want just to get the achievement. The following sets all count toward the achievement:

Reckoner Knight Armor (Kingdoms of Amalur demo bonus)

N7 Defender Armor (Gamestop pre-order bonus)

Blood Dragon Armor (Hanar Store)

Inferno Armor (Kassa Fabrications)

Collector Armor (Nos Astra Sporting Goods)

Terminus Assault Armor (Batarian State Arms)

Cerberus Armor (Elkoss Combine Arsenal Supplies)

After you have visited these stores from the Citadel, you may get to them anytime from the Normandy. There is an armory in the Shuttle Bay which when accessed, has a list of stores and the stuff you can buy from them.

Tourist 5
Complete one multiplayer match or two N7 missions.

See "Tour of Duty" achievement description.

Explorer 15 Complete three multiplayer matches or five N7 missions.

See "Tour of Duty" achievement description.

Gunsmith 25 Upgrade any weapon to level 10.

SP: In the shuttle bay of the Normandy, there is a weapon upgrades station. Here, you can upgrade any of your weapons for a price. As you purchase upgrades, the cost starts getting higher. The first upgrade choice will be level 2 for each weapon you own and you can get up to level 5 in a single playthrough. To get it to 10, you have to start a New Game+ and find the weapon a second time. This will unlock the final upgrades, allowing you to purchase up to level 10.

MP: Buy the recruit packs consistently and you will have a level 10 weapon fairly quickly. This is probably the quicker/easier of the two options of unlocking this achievement. I got three upgrades for the Mantis sniper rifle in my first five purchases.

Almost There 15 Reach level 15 in multiplayer or level 50 in single-player.

SP: Level 60 is the highest level you can obtain in Mass Effect 3. Once you hit this level, you will automatically gain the achievement. If you played Mass Effect 2 and imported your character, you will start the game leveled up. You can be as high as level 30 when you start your new game, meaning you are already halfway there.

MP: You must stick to one character and focus on leveling it up. It doesn't matter if you win or lose the matches, you will still gain experience. This is probably the faster option of the two to unlock this achievement.

Battle Scarred 25 Promote a multiplayer character to the Galaxy at War or import an ME3 character.

SP: Importing an ME3 character can obviously not be done if you have yet to finish the game with your ME3 character. This means, you must beat the game and with that save file, you can then import. This is what people will get when starting their 2nd run through of the game if they never imported. Other players must just start a new game and import.

MP: You must play enough to get one of your characters to the max rank (level 20). After doing this, you will be able to promote them.

Unwavering 50 Finish all multiplayer maps on Gold or all single-player missions on Insanity.

SP: There are a total of 27 missions, one of which (Priority: Earth) never shows up in your quest log. This achievement will unlock while going for your Insanity playthrough achievement, just be diligent that you complete side-quests as they are available because some are time-sensitive and can be failed (if you complete a "Priority" mission first). The full list of required quests can be found HERE, including instructions for when they open/close.

MP: You just have to beat each of the 6 maps on Gold (hardest difficulty) by finishing all ten waves. This is fairly difficult, so try to find a good team with communication and have high-level characters with a range of abilities.

You will be introduced to the Brute enemy during your mission on Palaven. This is the first main story mission after visiting the Citadel for the first time. As you are killing husks with a turret defending a barricade, your next fight will be against this monstrosity. Wear down the armor first, and try to avoid the husks that are also attacking. When you get it to 1 bar left, wait for it to charge at you. When it does, shoot it with your most powerful power or weapon. If it dies and isn't charging, you can try to let the husk enemies finish you off so you can restart the battle. These also appear online in the later waves if you miss them all in the campaign.

Defender 25 Attain the highest level of readiness in each theater of war.

*snip*

The only alternative to buying the Online Pass to play the normal MP portion of the game is if you own an iOS device (iPad, iPhone, iPod Touch) and download the "Datapad" app (free), or purchase the "Infiltrator" game ($7) which can also increase your Galactic Readiness.

Evidence presented in this thread shows that this isn't the case; your readiness might show as 100% within the app and on BSN, but the game will not pull that info without an Online Pass, thus not unlocking the achievement.

I think the apps should still be mentioned as an alternative to playing multiplayer though (just make it clear that the Online Pass is needed regardless), but it should be updated to note that Infiltrator is now available on Android.

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Originally Posted by Creech

As a site, we don't support calling it "xbone" as that was a name that was used to refer to the system in a negative light. Since the site exists to support the system, being deliberately negative towards it seems counter productive.

I had 7000 and change in EMS before starting the final Cerberus mission, and I did not get the "Master and Commander" achievement. I did not play multiplayer, though. I think it might be almost impossible to get it without poking in to multiplayer. It's definitely not 4000 EMS, though.

I had 7000 and change in EMS before starting the final Cerberus mission, and I did not get the "Master and Commander" achievement. I did not play multiplayer, though. I think it might be almost impossible to get it without poking in to multiplayer. It's definitely not 4000 EMS, though.

If you had never played MP, you would have a 50% Readiness Rating, so your 7000 Total Military Strength would translate to a 3500 Effective Military Strength. The number at the bottom is the one you need over 4000.

did anyone as a vanguard get hijacker? every damn atlas was exploding before i could blow the frontshild away. i carefully aiming only at the window and the damn thing always blows up

I got it on my Vanguard playthrough. Use the Scorpion (LVL1) pistol or the Katana Shotgun to blow the shield away, make sure your teammates aren't shooting at it and then when the shield is gone, shoot him either with the shotgun or pistol and he should die. I've done it a few times now.

It is possable to get all achievements in one play through with the exception of 'Defender'(odviously), 'Battle Scarred'(just start a new playthrough with NG+), 'Gunsmith' (just continue NG+ until you can get to the cargo hold and upgrade gun), 'Veteran' (5000, really) and...... 'Master and Commander'.

I have searched all over to see if this could be possable on my first playthrough and can quite confidently say that it is a no. Two reasons.

1. I have seen the save file transfer list and with all calculations you can only ammass 7600 and change in war assets.

2. Bioware have stated on one of there forums (buried under and behind red, green and blue tape) that it cannot be done.

I have found plenty more on the subject, but them two points about sum's it up.

Now to be ready to do it all in one playthrough you must be prepared to make a full insanity run doing everything and I mean everything.

A. Import a Femshep and change the class to sentinal (also change one thing on her for 'inlisted'). This is because you will need Warp for 'Pyromaniac', throw for 'Sky high' and overload for 'Overload Specialist'. Also the easiest romance option is with Traynor who's a carpet muncher.

B.Take Liara with you at all times and use and abuse her..... singularity for the combo for 'Combined Arms'. This also makes the majority of your playthrough relatively easy.

C.You can only reach level sixty in your first playthrough by doing the following.

Make sure insanity is switched on by the time you reach the first med box on earth. The game gives you 150 xp per med gel not used, thats 300xp per box and 450xp for wall mounted.

Do not use med gel. Ever. you need every bit of xp the box/wall gives you.

There are times that you will bump into Harvesters. Make sure you kill every last one before they fly off. This gains you another 100xp each.

If you follow these rules you should hit 50 after leaving the citadel priority II and level 60 whene you hit the final missile button before the..... erm.... end.

D. For the 'Bruiser' achievement on insanity, don't go out of you're way to get it, if you see something with low health and you can old school it go for it. Mine popped at the last battle.

E.At this level the kill brute/hyjack atlas can be challenging but I did manage them both. A bit like pulling teeth really. A relief and satisfying whene you get the 'berlip' unlock. I hyjacked the atlas at the end of the 'Gill' Grissom Acadamy whene I just used the one I was in machine guns on the glass.

All other achievements will come with natural progression and you check them off as you get them or go out of your way to finish them.

It took me fifty hours and one minute to do all this. Time enjoyably and well spent.

Hope this helps.

Last edited by TheHustlerShark; 06-20-2012 at 09:23 PM.
Reason: Included Atlas whatsit

really well put together guide but i think 4 is way to low i put this at 6.5 - 7.0, insane is really tough and some ach take some doing, but thats just my opinion. Am i right in thinking this can't actually been 1000 pointed in one playthrough due to gunsmith ??

In possibly one of the biggest blessings of all time, Unwavering does not require you to beat all missions on Insanity in the exact same play through. I missed one of the time sensitive missions on the Krogan planet and after beating the game, I reloaded a previous save, completed the mission and got the achievement, which saved me from having to play a second time through on Insanity. So the game does track which missions are beat on Insanity regardless of the play through, if that can help anyone else.

In possibly one of the biggest blessings of all time, Unwavering does not require you to beat all missions on Insanity in the exact same play through. I missed one of the time sensitive missions on the Krogan planet and after beating the game, I reloaded a previous save, completed the mission and got the achievement, which saved me from having to play a second time through on Insanity. So the game does track which missions are beat on Insanity regardless of the play through, if that can help anyone else.

Huh good to know, thanks for the info.

@ Tyger/Pants:

I'd raise the difficulty to at least 5(6)/10 since the INSANITY RUN is not that easy and I don't think this game is easier to complete than the previous Mass Effect games. All their guides have a 5/10 difficulty rating. Just saying! Other than that nice job as usual.

I'd still like a more elaborate guide on Master & Commander. People keep saying you can get it through single player alone, but they never provide any evidence. I was thorough and came up 500 short. Many people are in a similar position. Somebody said that if you go pure paragon or pure renegade, it's not possible. I'm inclined to believe them.

In possibly one of the biggest blessings of all time, Unwavering does not require you to beat all missions on Insanity in the exact same play through. I missed one of the time sensitive missions on the Krogan planet and after beating the game, I reloaded a previous save, completed the mission and got the achievement, which saved me from having to play a second time through on Insanity. So the game does track which missions are beat on Insanity regardless of the play through, if that can help anyone else.

Is there a list of all 27? I'm right about to start Priority:Earth and I'm at 25/27.

I'm going to verify though, because he basically says there are only 26 and that the ending of the game counts as a mission?

I finished the guide a few minutes ago and everything is confirmed I promise you. All my achievements popped when the final cutscene finished and before doing Cerberus Headquarters I had 24/27 and with 2 Priority Missions that would be 26. I was mad because I thought I missed one, I continued on and it popped.

I added the iOS option to Defender, and I also switched Master and Commander to online. I haven't seen a single person who claimed to have gotten it without raising their Readiness above 50% actually back it up with any data or proof, and I've seen plenty of people try their damnedest and fail - so I'm now convinced it's not possible through the campaign alone.

At one point my Overload Specialist count reset to zero (it was in it's 60's). This was 10 hours in, and I continued to use Overload throughout the game but the count remained 0 and never got the achievement.